I went ahead and cleared those posts out for you.
First off—in three out of your four attempts, you had
http://http// right at the beginning. It happened twice instead of just once.
And secondly, all four of those tries pointed to a webpage that *contains* an image, rather than linking directly to the image file itself.
For instance, your last attempt looked like this:

but what it actually needed to be was

which would result in:

I managed to grab the direct link to the image by copying the "Direct" field located to the right of the photo on the webpage
http://img92.imageshack.us/i/gumus2ug0.jpg/Another way is to grab the
Forum field under "Embed this Image"—though if you want the best way to handle massive images like this one, you should really just copy the
Forum field found under "Embed thumbnails for this image," which is also on the right side of the image. That gives you this:

Just a heads-up: if you go with the second or third method, you just copy the code from its specific box. Don't wrap it in
(image) tags, and don't bother using the "Insert Image" tool here on Reddit.